Any work recommended to be done in the report approved and adopted by the district board shall be done in conformity with the general plans and specifications contained in the report unless the district board, by a four-fifths vote, adopts a resolution declaring that the public interest requires a modification of or departure from the plans and specifications, which resolution shall contain a statement of the manner in which the modification is required or departure is to be made.
Ca. Health and Saf. Code § 4758